| cv.hd2part | Cross validation for hd2part models | 
| fit_subgroup_2part | Fitting subgroup identification models for semicontinuous positive outcomes | 
| hd2part | Main fitting function for group lasso and cooperative lasso penalized two part models | 
| hdgamma | Fitting function for lasso penalized GLMs | 
| HDtweedie_kfold_aug | Fit a penalized gamma augmentation model via cross fitting | 
| plot.cv.hd2part | Plot method for hd2part fitted objects | 
| plot.hd2part | Plot method for hd2part fitted objects | 
| predict.cv.hd2part | Prediction function for fitted cross validation hd2part objects | 
| predict.hd2part | Prediction method for two part fitted objects | 
| sim_semicontinuous_data | Generates data from a two part distribution with a point mass at zero and heterogeneous treatment effects |